JPMorgan(JPM) bragged about how it ended 2016 with record loan balances of $189 billion in its commercial bank. That's up an impressive 14% from the end of 2015.

One analyst, Kenneth Usdin from Jefferies, even complimented JPMorgan during the call on "another great year of double-digit loan growth."

Bank of America(BAC) also seems to be navigating the Dodd-Frank world pretty okay, when it comes to loans. BofA CEO Brian Moynihan said last month that commercial business loan growth "kicked up" during the fourth quarter as mid-size business borrowing was "strong."

Even Wells Fargo, which has been grappling with a scandal that's hurt its reputation, is lending more. Wells Fargo's(WFC) commercial loan book increased by 11% in the fourth quarter to nearly $507 billion.

Barney Frank, one of Dodd-Frank's authors, recently told CNNMoney there's "no evidence" to support Trump's claim that the law is killing lending.

"If we had inflicted a disaster on the American financial system, it would have shown up," Frank said.

"The only businesses that can obtain loans are those that can prove they don't actually need the loan," Harvey Pitt, who served as SEC commissioner under former President George W. Bush, told CNNMoney.

These early-stage companies aren't able to reliably turn to banks for loans because regulations have raised lending standards, Pitt said.

"Dodd-Frank has made it much harder for those businesses that are the true generators of economic growth to raise capital," he said.

To Pitt's point, the Fed small business survey shows that 50% of bank loan applicants faced a financing shortfall, meaning they received a smaller loan than they requested. Smaller businesses were dramatically more likely to run into loan roadblocks than larger ones.

Still, it only makes sense that banks would become more conservative after the worst financial crisis since the Great Depression. And unproven businesses have been able to turn to alternative sources of capital like venture capital and peer-to-peer lending.

None of this is to say that Dodd-Frank is perfect. Even Frank admits that community and midsize banks have been hurt by increased legal and compliance costs.

It's just tough to argue that Dodd-Frank has made it impossible to get a loan.

"I understand that may be a popular thing to say, but I don't think there's any evidence," James Pethokoukis, a columnist at the American Enterprise Institute, told CNBC.